On success, return a new file object that is opened on the file given by
filename, with a file mode given by mode, where mode has the same
semantics as the standard C routine fopen(). On failure, return NULL.

Create a new PyFileObject from the already-open standard C file
pointer, fp. The function close will be called when the file should be
closed. Return NULL and close the file using close on failure.
close is optional and can be set to NULL.

Increments the PyFileObject’s internal use count to indicate
that the underlying FILE* is being used.
This prevents Python from calling f_close() on it from another thread.
Callers of this must call PyFile_DecUseCount() when they are
finished with the FILE*. Otherwise the file object will
never be closed by Python.

Equivalent to p.readline([n]), this function reads one line from the
object p. p may be a file object or any object with a
readline()
method. If n is 0, exactly one line is read, regardless of the length of
the line. If n is greater than 0, no more than n bytes will be read
from the file; a partial line can be returned. In both cases, an empty string
is returned if the end of the file is reached immediately. If n is less than
0, however, one line is read regardless of length, but EOFError is
raised if the end of the file is reached immediately.

This function exists for internal use by the interpreter. Set the
softspace attribute of p to newflag and return the previous value.
p does not have to be a file object for this function to work properly; any
object is supported (thought its only interesting if the softspace
attribute can be set). This function clears any errors, and will return 0
as the previous value if the attribute either does not exist or if there were
errors in retrieving it. There is no way to detect errors from this function,
but doing so should not be needed.

Write object obj to file object p. The only supported flag for flags is
Py_PRINT_RAW; if given, the str() of the object is written
instead of the repr(). Return 0 on success or -1 on failure; the
appropriate exception will be set.